I had the same thought when I read it. Trans Oceanic may have conducted an exemplary investigation, I don't know.
But they are not going to accept any blame or liability by saying "our oversight of our investment sucked, it was our own fault".
BP has already passed the blame to their suppliers and sub contractors.
Any Govt investigation willing be tainted by BO's anti drilling agenda.
Will any one investigate who does not have an axe to grind ?
If so when can we expect to hear their report ?